Krydle of Baldur's Gate is a uncommon Legendary Creature — Human Elf Rogue card from Alchemy Horizons: Baldur's Gate (HBG), collector number 239.
Whenever Krydle deals combat damage to a player, that player loses 1 life and mills a card, then you gain 1 life and scry 1. Whenever you attack, you may pay {2}. If you do, target creature can't be blocked this turn.